Pump



Patented dan., 16, 1923.

PETER G. MACGREGOR, OF NEW YORK, N. Y., ASSGNOR TO PYRENE IVIABTUFACTURING COMPANY, .A CORPOBATON OF JELAWARE.

PUMP.

Application filed. April 15,

To all whom t may concern.'

Be it known that PETER G. MAGGREGOR, a citizen of the United States, and resident of the city, county, and State of New York, has invented certain new and useful Improvements in Pumps, of which the following is a specication.

This invention relates generally to pumps, more particularly to pumps of the portable hand-operated type adatped for use in throwing a stream of liquid through a suitable nozzle from a receptacle.

The invention has'for an object to provide a novel arrangement of parts in apump of this type whereby the discharge of the liquid is maintained by air pressure during the periods when the pump piston momentarily comes to rest at the end of each stroke, thus providing a continuous flow of the liquid from the nozzle.

A further object is to provide a construction in which the passage through the pump presents no restricted portions, thus increasing the ease and smoothness of operation of the pump.

For further comprehension of the invention and of the obj ects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

Fig. 1 of the drawings is a sectional View of a pump embodying the invention.

Fig. 2 is a fragmentary sectionalview of a portion of the handle, taken at a right angle to Fig. l. v A

Fig. 3 is an enlargedhorizontal section on t-he line 3 3 of Fig. 1.

In the drawings,lthe body of the pump cylinder is shown at 1 and may be conveniently made from metal tubing. The upper end of this tubing is threaded into the neck 2 of a globular head 3, which is preferably of larger diameter than the tubing, the neck 2 being formed with an integral surrounding flange l by which the pump may be secured in place in a suitable receptacle, a portion of which is shown at As here shown, a ring 6 is secured to thepinner side of the" receptacle wall 5. bolts 7 passing through suitable openings in this ring and in the wall of the receptacle and flange 4. rIhe liquid is discharged through the head Sand thelatter is formed' with a tubular 'projectionj'p to Adie being previa 1919r Serial No. 290,261.

which the end of a length of hose 9 may be attached and which is provided with a. nozzle 10, of the usual construction.

The piston of the pump, to be later referred to, is operated by a hollow piston rod 11 which extends through a suitable opening in the globular head 3, a stuliing box, indicated generally at 12, being provided to prevent leakage.

The upper end of Jthe piston rod is threaded into the bottom of a handle 13, the hanled in its lower portion with an enclosed chamber 11i (Figs. 1 and 2) into which the hollow piston rod 11 leads, the piston rod being open at both ends and eX- tending completely through the piston at its lower end.

A peripheral indentation or corrugation 15 is formed near the lower end of the piston rod 11 and a ring 16 is soldered or otherwise secured in this indentation about the exterior of the piston rod 11, the indentation 15 providing a. seat for a one-way valve 17 slidably mounted in the piston rod 11 and the ring `16 providing an abutment shoulder for the piston.

The piston comprises a flanged sleeve 18 which is slipped over the lower end of the piston rod 11 with its fiange engaging the ring 16, this sleeve being surrounded by a piston ring 19 of suitable material held in place by a nut 20 threaded on the lower end of the piston rod 11.

Thevalve 17 is in the form of a cup whose closed end seat-s on the shoulder provided by the indentation 15 when in its lower position and which has a sliding fit in the piston rod 11, movement of the valve away from its seat 15 being limited by a pin 21 extending across the piston rod 11. A'series of ports or openings 22 are provided 1n the wall of the piston rod 11 just above the indentation 15, while a second series of ports or openings 23 arev provided in the said wall at a point above the upper limit of movement of the valve 17.

The lower end of the pump cylinder 1 has attached thereinto a head 24e, which is recessed in its lower portion, as at 25, and is provided with a central aperture 26 in its upper portion, this aperture being closed by a valve 27 having a cylindrical extension 28 on one' side which' slides in the aperture 26 and constitutes avalve stem, this extension billg formed with a series of ports or openings 2D located close to the upper-closed end of the valve 27.

The valve 27 seats on the top oi .the head S24 and movement thereof away vfroml its seat is limited by a' pin 3() extending acrossthe piston cylinder 1, head :Zet may be covered with a. ivierlorated disk 31.

rlhe cross sectional area ol the piston rod 11 is approximately one-half that ot the cylinder 1 so that' the active piston area is substantially 'the sameas the opening' provided through the piston bvthe piston rod 11. rlhe opening through the head 2l is also of the same areaand; asa consequence, the intake to the pump cylinder is atV all pointeof substantiallyl as large an' area as the active piston area and Vnoexftra pressure is required to draw or force'y the liquid through inv its'flow to the active cylinder space, andthepump maybefoperated with a. minimum-of effort for agivennozzle pressure.4 It'will, of" course, be understood that the passage' provided 'by the openings 22 Sand 29 and bytheperforated cap 31 are of' equal area to that through 4the piston rod.

The manner in which the pump yoperates isi ais-follows: The upstrolrer offE the piston' draws? the liquid in through the openingQG inthe head- Qlt. the valve 27` liftingv from its seat and permitting the liquid to How lthrough the ports 29 `in thel cylindrical valve stem 128 to the pump cylinder` 1 below the piston. Atvthe saine timel the pistonA disiehargesthe liquid which' the previous down stroke has fed into the cylinder above the piston.l

VVhenthe -piston starts its downstroke the valve 27 closes and the valve `17 moves upwardly to the stop :21, uncovering` the ports 22m the'piston rod 11 and the liquid in the pump cylinder 1 below the piston passes through the open lower end of the piston rod andthrough these ports 22 into the active cylinder space in the pump cylinder 1 above the piston.

Since the-interior of the hollowpiston rod above the valve 17 is at all timeslin communication withfthe cylinder space above theepistoir though the openingij` Q3 itf'lollowe that the pressurei exerted' in bothup and downstrolres will tend to bachy the liquid up `inther piston red 11 aga-inst the cushion of air whichw'ill be. formed-'in theclosed space formedfbv'fthe pistonrod 11 and the chamber 14 in the handle '13, thus creatineF an air pressure on the liquid substantially equal to the piston pressure.

When the piston-pressure or: movement 'momentarilyceases atthe endof each stroke this air pressure forces the liquid which has :been backed up 'in the rod 11 downward andi-.tiras continueef-v the discharging action unti the pistoni.`- again-'lbecomesffaoblvef,Caus- The' lower' end of the" from vthe nozzle by the reriproeation oil the piston. `Itwill be understood, of course, that a very slight diminution in the flow through the nozzle during the movement oit the piston results from the backingr up ot the liquid inthe hollow piston rod. The amount of liquid entering` the rod is comparatively small, by reason of the relatively light pressure exerted on the handle 18, the chamber 14 being formed in the handle to provide the proper volume of air` necessary for sufficient]compression to insure of sufficient liquidentering;` the Vpistonfrod to continue the stream from the nozzle duringthe momentary intervals between the strokes.

The air'pressurein the piston `rod doesnot affect the action of the valve 17 except to tend to `cause it toclose more quickly'on the termination of the downstroke and to open more slowly at; the commencement of the downstrolrein the event oi?V a retardedapplication of full Vpressure on thei piston at the commencement-of each stroke. This, however does vnot aiiect the continuity of the discharge, the transfer from the air cushion to the piston as the active discharging medium being instantaneous once the piston pressure overbalances the storedvair pressure. In actual operation, there will be a slight rising and falling off the liquid in the piston rod 11 at each stroke of'lthe piston. y

The globular head?) serves as a reservoir to ensure against.- the occurrence of any slight fluctuations in the stream. lt will be Iunderstoochoii course, thata `strokeor so willbe requiredto,fillthe pump vat the start before it operates continuously as just described.

The particular piston construction and arrangement herein set forth provides, in a direct hand operated pump withits resultant restricted area, maximum passage for the liquid through the piston. i

WhatfIelaim is 1 fIn a device` of` the class described, a piston rod in the form of a tube having a peripheral indentationin the wall thereof near its lower end, a piston element mounted onand sln'roundingj-said piston rod below said indent-ation.l and valve slidablv inountedin said iston rod and adapted to seat upon said indentation to control the passage-ithrough'said piston.

2, In a devicecf the class described apieon rodin the-form ofla tubehavingaupeu ripheral indentation in the wallt-hereofnear its open-lower end a ringA secured insaid indentation,v a piston element si1rroundingn the lower endoit the piston rod' and held against longitudinal*movement b v the said ring,V and-a valve)slid'able in thepsaid ypiston rodlv4 and Aadaptedf to seat upon the-#saidindntatontecotltrl the rassage-throughsthe v p1 t 3. ln a device ot the class described, a piston rod in the foi-m of a tube having a peripheral indentation in the Wall thereof near its lovvei` end, a ring' secured in said indentation. a piston mounted. on the lower end of Said rod and held against longitudinal displacement by said ring, an opening in the Wall of Said rod above the said indentation, and a valve slidable in the said rod and adapted to seat upon the said indentation to close the said opening, said valve comprising a cup having a slidable fit in the said rod.

4. In a. device of the class described, a

hollow pieton rod in the form of a tuhe having a peripheral indentation in the Wall thereof near its lower end, a ring' secured in said indentation a sleeve upon said rod having` a iange adapted to hear on the said ring; a piston element surrounding the said sleeve, and a nut threaded upon the lower end of the piston rod and holding said piston element upon the said sleeve.

Signed at the city, county and State ot New York, this 11th day of April, 1919.

PETER G. MACGREGOR. 

